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// errchk $G -e $D/$F.go

// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

type I interface {
        M()
}

func bad() {
        var i I
        var s string

        switch i {
        case s: // ERROR "mismatched types string and I|incompatible types"
        }

        switch s {
        case i: // ERROR "mismatched types I and string|incompatible types"
        }

        var m, m1 map[int]int
        switch m {
        case nil:
        case m1: // ERROR "can only compare map m to nil|map can only be compared to nil"
        default:
        }

        var a, a1 []int
        switch a {
        case nil:
        case a1: // ERROR "can only compare slice a to nil|slice can only be compared to nil"
        default:
        }

        var f, f1 func()
        switch f {
        case nil:
        case f1: // ERROR "can only compare func f to nil|func can only be compared to nil"
        default:
        }
}

func good() {
        var i interface{}
        var s string

        switch i {
        case s:
        }

        switch s {
        case i:
        }
}